Portability Subroutine: Changes the starting point of the pseudorandom number generator.
Module: USE IFPORT
Syntax
CALL SEED (iseed)
iseed
(Input) INTEGER(4). Starting point for RANDOM.
SEED uses iseed to establish the starting point of the pseudorandom number generator. A given seed always produces the same sequence of values from RANDOM.
If SEED is not called before the first call to RANDOM, RANDOM always begins with a seed value of one. If a program must have a different pseudorandom sequence each time it runs, pass the constant RND$TIMESEED (defined in IFPORT.F90
) to the SEED routine before the first call to RANDOM.
This routine is not thread-safe.
Compatibility
CONSOLE STANDARD GRAPHICS QUICKWIN GRAPHICS WINDOWS DLL LIB
See Also
RANDOM, RANDOM_SEED, RANDOM_NUMBER
Example
USE IFPORT
REAL myrand
CALL SEED(7531)
CALL RANDOM(myrand)